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UNIX socket support for Twisted.
End users shouldn't use this module directly - use the reactor APIs instead.
Maintainer: Itamar Shtull-Trauring
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interfaces)�protocol�address)�lockfile�log�reflect�failure)�_coerceToFilesystemEncoding)�untilConcludes)�
lazyByteSlice)�sendmsgc C s t �d| �}tjtj|fgS )zh
Pack an integer into an ancillary data structure suitable for use with
L{sendmsg.sendmsg}.
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_SendmsgMixina
Mixin for stream-oriented UNIX transports which uses sendmsg and recvmsg to
offer additional functionality, such as copying file descriptors into other
processes.
@ivar _writeSomeDataBase: The class which provides the basic implementation
of C{writeSomeData}. Ultimately this should be a subclass of
L{twisted.internet.abstract.FileDescriptor}. Subclasses which mix in
L{_SendmsgMixin} must define this.
@ivar _sendmsgQueue: A C{list} of C{int} holding file descriptors which are
currently buffered before being sent.
@ivar _fileDescriptorBufferSize: An C{int} giving the maximum number of file
descriptors to accept and queue for sending before pausing the
registered producer, if there is one.
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_sendmsgQueue��selfr$ r$ r% �__init__J s z_SendmsgMixin.__init__c C s t | j�| jkp| j�| �S )a�
Determine whether the user-space send buffer for this transport is full
or not.
This extends the base determination by adding consideration of how many
file descriptors need to be sent using L{sendmsg.sendmsg}. When there
are more than C{self._fileDescriptorBufferSize}, the buffer is
considered full.
@return: C{True} if it is full, C{False} otherwise.
)�lenr* �_fileDescriptorBufferSize�_writeSomeDataBase�_isSendBufferFullr+ r$ r$ r% r1 N s
�z _SendmsgMixin._isSendBufferFullc C s | j �|� | �� | �� dS )zY
Queue the given file descriptor to be sent and start trying to send it.
N)r* �appendZ_maybePauseProducerZ startWriting)r, �filenor$ r$ r% �sendFileDescriptorf s z _SendmsgMixin.sendFileDescriptorc
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Send as much of C{data} as possible. Also send any pending file
descriptors.
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Calls {IProtocol.dataReceived} with all available data and
L{IFileDescriptorReceiver.fileDescriptorReceived} once for each
received file descriptor in ancillary data.
This reads up to C{self.bufferSize} bytes of data from its socket, then
dispatches the data to protocol callbacks to be handled. If the
connection is not lost through an error in the underlying recvmsg(),
this function will return the result of the dataReceived call.
r Nz�%(protocolName)s (on %(hostAddress)r) received unsupported ancillary data (level=%(cmsgLevel)r, type=%(cmsgType)r) from %(peerAddress)r.)�format� hostAddress� peerAddress� protocolName� cmsgLevel�cmsgType)r r Zrecvmsgr Z
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Processes ancillary data with level SOL_SOCKET and type SCM_RIGHTS,
indicating that the ancillary data payload holds file descriptors.
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implement L{IFileDescriptorReceiver}.
@param cmsgData: Ancillary data payload.
@type cmsgData: L{bytes}
� r z�%(protocolName)s (on %(hostAddress)r) does not provide IFileDescriptorReceiver; closing file descriptor received (from %(peerAddress)r).)r> r? r@ rA N)r. r Zunpackr ZIFileDescriptorReceiverZ
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Behaviorless placeholder used when C{twisted.python.sendmsg} is not
available, preventing L{IUNIXTransport} from being supported.
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Create a new L{Server} based on an existing connected I{SOCK_STREAM}
socket.
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@param fileDescriptor: An integer file descriptor associated with a
connected socket. The socket must be in non-blocking mode. Any
additional attributes desired, such as I{FD_CLOEXEC}, must also be
set already.
@return: A new instance of C{cls} wrapping the socket given by
C{fileDescriptor}.
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Determine whether the given unix socket path is in a filesystem namespace.
While most PF_UNIX sockets are entries in the filesystem, Linux 2.2 and
above support PF_UNIX sockets in an "abstract namespace" that does not
correspond to any path. This function returns C{True} if the given socket
path is stored in the filesystem and C{False} if the path is in this
abstract namespace.
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Returns a UNIXAddress.
This indicates the server's address.
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Create a new L{Port} based on an existing listening I{SOCK_STREAM}
socket.
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socket. The socket must be in non-blocking mode. Any additional
attributes desired, such as I{FD_CLOEXEC}, must also be set already.
@return: A new instance of C{cls} wrapping the socket given by C{fd}.
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Create and bind my socket, and begin listening on it.
This is called on unserialization, and must be called after creating a
server to begin listening on the specified port.
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Log message for closing socket
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Datagram UNIX port, listening for packets.
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A connected datagram UNIX socket.
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Called when a connection fails. Stop listening on the socket.
@type reason: L{Failure}
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Called when my socket is ready for reading.
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Write a datagram.
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